KShell: Checking characters in a string.

How do I get characters from a string?  For instance, I have  file names that are P125ABC, P126XYZ, and X127ABC.  I want to choose the file with characters 126 in the 2nd through 4th postion.  Is there a command which returns the value of a substring?
randynAsked:
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ahoffmannConnect With a Mentor Commented:
echo P126XYZ|cut -b2-4
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